Investments (Held-to-Maturity Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 1,314	$ 1,502
Gross Unrecognized Gains	99	107
Gross Unrecognized Losses	0	0
Fair Value	1,413	1,609
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,014	1,194
Gross Unrecognized Gains	85	91
Gross Unrecognized Losses	0	0
Fair Value	1,099	1,285
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	145	145
Gross Unrecognized Gains	1	2
Gross Unrecognized Losses	0	0
Fair Value	146	147
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	155	163
Gross Unrecognized Gains	13	14
Gross Unrecognized Losses	0	0
Fair Value	$ 168	$ 177